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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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#include <linux/mm.h>#include <linux/mm_types.h>#include <linux/mmdebug.h>#include <linux/fs.h>#include <linux/hugetlb_inline.h>#include <linux/cgroup.h>#include <linux/page_ref.h>#include <linux/list.h>#include <linux/kref.h>#include <linux/pgtable.h>#include <linux/gfp.h>#include <linux/userfaultfd_k.h>#include <linux/nodemask.h>
struct mmu_gather;struct node;
void free_huge_folio(struct folio *folio);
#ifdef CONFIG_HUGETLB_PAGE
#include <linux/pagemap.h>#include <linux/shm.h>#include <asm/tlbflush.h>
/* * For HugeTLB page, there are more metadata to save in the struct page. But * the head struct page cannot meet our needs, so we have to abuse other tail * struct page to store the metadata. */#define __NR_USED_SUBPAGE 3
struct hugepage_subpool { spinlock_t lock; long count; long max_hpages; /* Maximum huge pages or -1 if no maximum. */ long used_hpages; /* Used count against maximum, includes */ /* both allocated and reserved pages. */ struct hstate *hstate; long min_hpages; /* Minimum huge pages or -1 if no minimum. */ long rsv_hpages; /* Pages reserved against global pool to */ /* satisfy minimum size. */};
struct resv_map { struct kref refs; spinlock_t lock; struct list_head regions; long adds_in_progress; struct list_head region_cache; long region_cache_count; struct rw_semaphore rw_sema;#ifdef CONFIG_CGROUP_HUGETLB /* * On private mappings, the counter to uncharge reservations is stored * here. If these fields are 0, then either the mapping is shared, or * cgroup accounting is disabled for this resv_map. */ struct page_counter *reservation_counter; unsigned long pages_per_hpage; struct cgroup_subsys_state *css;#endif};
/* * Region tracking -- allows tracking of reservations and instantiated pages * across the pages in a mapping. * * The region data structures are embedded into a resv_map and protected * by a resv_map's lock. The set of regions within the resv_map represent * reservations for huge pages, or huge pages that have already been * instantiated within the map. The from and to elements are huge page * indices into the associated mapping. from indicates the starting index * of the region. to represents the first index past the end of the region. * * For example, a file region structure with from == 0 and to == 4 represents * four huge pages in a mapping. It is important to note that the to element * represents the first element past the end of the region. This is used in * arithmetic as 4(to) - 0(from) = 4 huge pages in the region. * * Interval notation of the form [from, to) will be used to indicate that * the endpoint from is inclusive and to is exclusive. */struct file_region { struct list_head link; long from; long to;#ifdef CONFIG_CGROUP_HUGETLB /* * On shared mappings, each reserved region appears as a struct * file_region in resv_map. These fields hold the info needed to * uncharge each reservation. */ struct page_counter *reservation_counter; struct cgroup_subsys_state *css;#endif};
struct hugetlb_vma_lock { struct kref refs; struct rw_semaphore rw_sema; struct vm_area_struct *vma;};
extern struct resv_map *resv_map_alloc(void);void resv_map_release(struct kref *ref);
extern spinlock_t hugetlb_lock;extern int hugetlb_max_hstate __read_mostly;#define for_each_hstate(h) \ for ((h) = hstates; (h) < &hstates[hugetlb_max_hstate]; (h)++)
struct hugepage_subpool *hugepage_new_subpool(struct hstate *h, long max_hpages, long min_hpages);void hugepage_put_subpool(struct hugepage_subpool *spool);
void hugetlb_dup_vma_private(struct vm_area_struct *vma);void clear_vma_resv_huge_pages(struct vm_area_struct *vma);int move_hugetlb_page_tables(struct vm_area_struct *vma, struct vm_area_struct *new_vma, unsigned long old_addr, unsigned long new_addr, unsigned long len);int copy_hugetlb_page_range(struct mm_struct *, struct mm_struct *, struct vm_area_struct *, struct vm_area_struct *);void unmap_hugepage_range(struct vm_area_struct *, unsigned long start, unsigned long end, struct folio *, zap_flags_t);void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma, unsigned long start, unsigned long end, struct folio *, zap_flags_t zap_flags);void hugetlb_report_meminfo(struct seq_file *);int hugetlb_report_node_meminfo(char *buf, int len, int nid);void hugetlb_show_meminfo_node(int nid);unsigned long hugetlb_total_pages(void);vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long address, unsigned int flags);#ifdef CONFIG_USERFAULTFDint hugetlb_mfill_atomic_pte(pte_t *dst_pte, struct vm_area_struct *dst_vma, unsigned long dst_addr, unsigned long src_addr, uffd_flags_t flags, struct folio **foliop);#endif /* CONFIG_USERFAULTFD */long hugetlb_reserve_pages(struct inode *inode, long from, long to, struct vm_area_struct *vma, vma_flags_t vma_flags);long hugetlb_unreserve_pages(struct inode *inode, long start, long end, long freed);bool folio_isolate_hugetlb(struct folio *folio, struct list_head *list);int get_hwpoison_hugetlb_folio(struct folio *folio, bool *hugetlb, bool unpoison);void folio_putback_hugetlb(struct folio *folio);void move_hugetlb_state(struct folio *old_folio, struct folio *new_folio, int reason);void hugetlb_fix_reserve_counts(struct inode *inode);extern struct mutex *hugetlb_fault_mutex_table;u32 hugetlb_fault_mutex_hash(struct address_space *mapping, pgoff_t idx);
pte_t *huge_pmd_share(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, pud_t *pud);bool hugetlbfs_pagecache_present(struct hstate *h, struct vm_area_struct *vma, unsigned long address);
struct address_space *hugetlb_folio_mapping_lock_write(struct folio *folio);
extern int movable_gigantic_pages __read_mostly;extern int sysctl_hugetlb_shm_group __read_mostly;extern struct list_head huge_boot_pages[MAX_NUMNODES];
void hugetlb_bootmem_alloc(void);extern nodemask_t hugetlb_bootmem_nodes;void hugetlb_bootmem_set_nodes(void);
/* arch callbacks */
#ifndef CONFIG_HIGHPTE/* * pte_offset_huge() and pte_alloc_huge() are helpers for those architectures * which may go down to the lowest PTE level in their huge_pte_offset() and * huge_pte_alloc(): to avoid reliance on pte_offset_map() without pte_unmap(). */static inline pte_t *pte_offset_huge(pmd_t *pmd, unsigned long address){ return pte_offset_kernel(pmd, address);}static inline pte_t *pte_alloc_huge(struct mm_struct *mm, pmd_t *pmd, unsigned long address){ return pte_alloc(mm, pmd) ? NULL : pte_offset_huge(pmd, address);}#endif
pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, unsigned long sz);/* * huge_pte_offset(): Walk the hugetlb pgtable until the last level PTE. * Returns the pte_t* if found, or NULL if the address is not mapped. * * IMPORTANT: we should normally not directly call this function, instead * this is only a common interface to implement arch-specific * walker. Please use hugetlb_walk() instead, because that will attempt to * verify the locking for you. * * Since this function will walk all the pgtable pages (including not only * high-level pgtable page, but also PUD entry that can be unshared * concurrently for VM_SHARED), the caller of this function should be * responsible of its thread safety. One can follow this rule: * * (1) For private mappings: pmd unsharing is not possible, so holding the * mmap_lock for either read or write is sufficient. Most callers * already hold the mmap_lock, so normally, no special action is * required. * * (2) For shared mappings: pmd unsharing is possible (so the PUD-ranged * pgtable page can go away from under us! It can be done by a pmd * unshare with a follow up munmap() on the other process), then we * need either: * * (2.1) hugetlb vma lock read or write held, to make sure pmd unshare * won't happen upon the range (it also makes sure the pte_t we * read is the right and stable one), or, * * (2.2) hugetlb mapping i_mmap_rwsem lock held read or write, to make * sure even if unshare happened the racy unmap() will wait until * i_mmap_rwsem is released. * * Option (2.1) is the safest, which guarantees pte stability from pmd * sharing pov, until the vma lock released. Option (2.2) doesn't protect * a concurrent pmd unshare, but it makes sure the pgtable page is safe to * access. */pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr, unsigned long sz);unsigned long hugetlb_mask_last_page(struct hstate *h);int huge_pmd_unshare(struct mmu_gather *tlb, struct vm_area_struct *vma, unsigned long addr, pte_t *ptep);void huge_pmd_unshare_flush(struct mmu_gather *tlb, struct vm_area_struct *vma);void adjust_range_if_pmd_sharing_possible(struct vm_area_struct *vma, unsigned long *start, unsigned long *end);
extern void __hugetlb_zap_begin(struct vm_area_struct *vma, unsigned long *begin, unsigned long *end);extern void __hugetlb_zap_end(struct vm_area_struct *vma, struct zap_details *details);
static inline void hugetlb_zap_begin(struct vm_area_struct *vma, unsigned long *start, unsigned long *end){ if (is_vm_hugetlb_page(vma)) __hugetlb_zap_begin(vma, start, end);}
static inline void hugetlb_zap_end(struct vm_area_struct *vma, struct zap_details *details){ if (is_vm_hugetlb_page(vma)) __hugetlb_zap_end(vma, details);}
void hugetlb_vma_lock_read(struct vm_area_struct *vma);void hugetlb_vma_unlock_read(struct vm_area_struct *vma);void hugetlb_vma_lock_write(struct vm_area_struct *vma);void hugetlb_vma_unlock_write(struct vm_area_struct *vma);int hugetlb_vma_trylock_write(struct vm_area_struct *vma);void hugetlb_vma_assert_locked(struct vm_area_struct *vma);void hugetlb_vma_lock_release(struct kref *kref);long hugetlb_change_protection(struct vm_area_struct *vma, unsigned long address, unsigned long end, pgprot_t newprot, unsigned long cp_flags);void hugetlb_unshare_all_pmds(struct vm_area_struct *vma);void fixup_hugetlb_reservations(struct vm_area_struct *vma);void hugetlb_split(struct vm_area_struct *vma, unsigned long addr);
unsigned int arch_hugetlb_cma_order(void);
#else /* !CONFIG_HUGETLB_PAGE */
static inline void hugetlb_dup_vma_private(struct vm_area_struct *vma){}
static inline void clear_vma_resv_huge_pages(struct vm_area_struct *vma){}
static inline unsigned long hugetlb_total_pages(void){ return 0;}
static inline struct address_space *hugetlb_folio_mapping_lock_write( struct folio *folio){ return NULL;}
static inline int huge_pmd_unshare(struct mmu_gather *tlb, struct vm_area_struct *vma, unsigned long addr, pte_t *ptep){ return 0;}
static inline void huge_pmd_unshare_flush(struct mmu_gather *tlb, struct vm_area_struct *vma){}
static inline void adjust_range_if_pmd_sharing_possible( struct vm_area_struct *vma, unsigned long *start, unsigned long *end){}
static inline void hugetlb_zap_begin( struct vm_area_struct *vma, unsigned long *start, unsigned long *end){}
static inline void hugetlb_zap_end( struct vm_area_struct *vma, struct zap_details *details){}
static inline int copy_hugetlb_page_range(struct mm_struct *dst, struct mm_struct *src, struct vm_area_struct *dst_vma, struct vm_area_struct *src_vma){ BUG(); return 0;}
static inline int move_hugetlb_page_tables(struct vm_area_struct *vma, struct vm_area_struct *new_vma, unsigned long old_addr, unsigned long new_addr, unsigned long len){ BUG(); return 0;}
static inline void hugetlb_report_meminfo(struct seq_file *m){}
static inline int hugetlb_report_node_meminfo(char *buf, int len, int nid){ return 0;}
static inline void hugetlb_show_meminfo_node(int nid){}
static inline void hugetlb_vma_lock_read(struct vm_area_struct *vma){}
static inline void hugetlb_vma_unlock_read(struct vm_area_struct *vma){}
static inline void hugetlb_vma_lock_write(struct vm_area_struct *vma){}
static inline void hugetlb_vma_unlock_write(struct vm_area_struct *vma){}
static inline int hugetlb_vma_trylock_write(struct vm_area_struct *vma){ return 1;}
static inline void hugetlb_vma_assert_locked(struct vm_area_struct *vma){}
static inline int is_hugepage_only_range(struct mm_struct *mm, unsigned long addr, unsigned long len){ return 0;}
#ifdef CONFIG_USERFAULTFDstatic inline int hugetlb_mfill_atomic_pte(pte_t *dst_pte, struct vm_area_struct *dst_vma, unsigned long dst_addr, unsigned long src_addr, uffd_flags_t flags, struct folio **foliop){ BUG(); return 0;}#endif /* CONFIG_USERFAULTFD */
static inline pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr, unsigned long sz){ return NULL;}
static inline bool folio_isolate_hugetlb(struct folio *folio, struct list_head *list){ return false;}
static inline int get_hwpoison_hugetlb_folio(struct folio *folio, bool *hugetlb, bool unpoison){ return 0;}
static inline void folio_putback_hugetlb(struct folio *folio){}
static inline void move_hugetlb_state(struct folio *old_folio, struct folio *new_folio, int reason){}
static inline long hugetlb_change_protection( struct vm_area_struct *vma, unsigned long address, unsigned long end, pgprot_t newprot, unsigned long cp_flags){ return 0;}
static inline void __unmap_hugepage_range(struct mmu_gather *tlb, struct vm_area_struct *vma, unsigned long start, unsigned long end, struct folio *folio, zap_flags_t zap_flags){ BUG();}
static inline vm_fault_t hugetlb_fault(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long address, unsigned int flags){ BUG(); return 0;}
static inline void hugetlb_unshare_all_pmds(struct vm_area_struct *vma) { }
static inline void fixup_hugetlb_reservations(struct vm_area_struct *vma){}
static inline void hugetlb_split(struct vm_area_struct *vma, unsigned long addr) {}
#endif /* !CONFIG_HUGETLB_PAGE */
#ifndef pgd_writestatic inline int pgd_write(pgd_t pgd){ BUG(); return 0;}#endif
#define HUGETLB_ANON_FILE "anon_hugepage"
enum { /* * The file will be used as an shm file so shmfs accounting rules * apply */ HUGETLB_SHMFS_INODE = 1, /* * The file is being created on the internal vfs mount and shmfs * accounting rules do not apply */ HUGETLB_ANONHUGE_INODE = 2,};
#ifdef CONFIG_HUGETLBFSstruct hugetlbfs_sb_info { long max_inodes; /* inodes allowed */ long free_inodes; /* inodes free */ spinlock_t stat_lock; struct hstate *hstate; struct hugepage_subpool *spool; kuid_t uid; kgid_t gid; umode_t mode;};
static inline struct hugetlbfs_sb_info *HUGETLBFS_SB(struct super_block *sb){ return sb->s_fs_info;}
struct hugetlbfs_inode_info { struct inode vfs_inode; struct resv_map *resv_map; unsigned int seals;};
static inline struct hugetlbfs_inode_info *HUGETLBFS_I(struct inode *inode){ return container_of(inode, struct hugetlbfs_inode_info, vfs_inode);}
extern const struct vm_operations_struct hugetlb_vm_ops;struct file *hugetlb_file_setup(const char *name, size_t size, vma_flags_t acct, int creat_flags, int page_size_log);
static inline bool is_file_hugepages(const struct file *file){ return file->f_op->fop_flags & FOP_HUGE_PAGES;}
static inline struct hstate *hstate_inode(struct inode *i){ return HUGETLBFS_SB(i->i_sb)->hstate;}#else /* !CONFIG_HUGETLBFS */
#define is_file_hugepages(file) falsestatic inline struct file *hugetlb_file_setup(const char *name, size_t size, vma_flags_t acctflag, int creat_flags, int page_size_log){ return ERR_PTR(-ENOSYS);}
static inline struct hstate *hstate_inode(struct inode *i){ return NULL;}#endif /* !CONFIG_HUGETLBFS */
unsigned longhugetlb_get_unmapped_area(struct file *file, unsigned long addr, unsigned long len, unsigned long pgoff, unsigned long flags);
/* * huegtlb page specific state flags. These flags are located in page.private * of the hugetlb head page. Functions created via the below macros should be * used to manipulate these flags. * * HPG_restore_reserve - Set when a hugetlb page consumes a reservation at * allocation time. Cleared when page is fully instantiated. Free * routine checks flag to restore a reservation on error paths. * Synchronization: Examined or modified by code that knows it has * the only reference to page. i.e. After allocation but before use * or when the page is being freed. * HPG_migratable - Set after a newly allocated page is added to the page * cache and/or page tables. Indicates the page is a candidate for * migration. * Synchronization: Initially set after new page allocation with no * locking. When examined and modified during migration processing * (isolate, migrate, putback) the hugetlb_lock is held. * HPG_temporary - Set on a page that is temporarily allocated from the buddy * allocator. Typically used for migration target pages when no pages * are available in the pool. The hugetlb free page path will * immediately free pages with this flag set to the buddy allocator. * Synchronization: Can be set after huge page allocation from buddy when * code knows it has only reference. All other examinations and * modifications require hugetlb_lock. * HPG_freed - Set when page is on the free lists. * Synchronization: hugetlb_lock held for examination and modification. * HPG_vmemmap_optimized - Set when the vmemmap pages of the page are freed. * HPG_raw_hwp_unreliable - Set when the hugetlb page has a hwpoison sub-page * that is not tracked by raw_hwp_page list. */enum hugetlb_page_flags { HPG_restore_reserve = 0, HPG_migratable, HPG_temporary, HPG_freed, HPG_vmemmap_optimized, HPG_raw_hwp_unreliable, HPG_cma, __NR_HPAGEFLAGS,};
/* * Macros to create test, set and clear function definitions for * hugetlb specific page flags. */#ifdef CONFIG_HUGETLB_PAGE#define TESTHPAGEFLAG(uname, flname) \static __always_inline \bool folio_test_hugetlb_##flname(struct folio *folio) \ { void *private = &folio->private; \ return test_bit(HPG_##flname, private); \ }
#define SETHPAGEFLAG(uname, flname) \static __always_inline \void folio_set_hugetlb_##flname(struct folio *folio) \ { void *private = &folio->private; \ set_bit(HPG_##flname, private); \ }
#define CLEARHPAGEFLAG(uname, flname) \static __always_inline \void folio_clear_hugetlb_##flname(struct folio *folio) \ { void *private = &folio->private; \ clear_bit(HPG_##flname, private); \ }#else#define TESTHPAGEFLAG(uname, flname) \static inline bool \folio_test_hugetlb_##flname(struct folio *folio) \ { return 0; }
#define SETHPAGEFLAG(uname, flname) \static inline void \folio_set_hugetlb_##flname(struct folio *folio) \ { }
#define CLEARHPAGEFLAG(uname, flname) \static inline void \folio_clear_hugetlb_##flname(struct folio *folio) \ { }#endif
#define HPAGEFLAG(uname, flname) \ TESTHPAGEFLAG(uname, flname) \ SETHPAGEFLAG(uname, flname) \ CLEARHPAGEFLAG(uname, flname) \
/* * Create functions associated with hugetlb page flags */HPAGEFLAG(RestoreReserve, restore_reserve)HPAGEFLAG(Migratable, migratable)HPAGEFLAG(Temporary, temporary)HPAGEFLAG(Freed, freed)HPAGEFLAG(VmemmapOptimized, vmemmap_optimized)HPAGEFLAG(RawHwpUnreliable, raw_hwp_unreliable)HPAGEFLAG(Cma, cma)
#ifdef CONFIG_HUGETLB_PAGE
#define HSTATE_NAME_LEN 32/* Defines one hugetlb page size */struct hstate { struct mutex resize_lock; struct lock_class_key resize_key; int next_nid_to_alloc; int next_nid_to_free; unsigned int order; unsigned int demote_order; unsigned long mask; unsigned long max_huge_pages; unsigned long nr_huge_pages; unsigned long free_huge_pages; unsigned long resv_huge_pages; unsigned long surplus_huge_pages; unsigned long nr_overcommit_huge_pages; struct list_head hugepage_activelist; struct list_head hugepage_freelists[MAX_NUMNODES]; unsigned int max_huge_pages_node[MAX_NUMNODES]; unsigned int nr_huge_pages_node[MAX_NUMNODES]; unsigned int free_huge_pages_node[MAX_NUMNODES]; unsigned int surplus_huge_pages_node[MAX_NUMNODES]; char name[HSTATE_NAME_LEN];};
struct cma;
struct huge_bootmem_page { struct list_head list; struct hstate *hstate; unsigned long flags; struct cma *cma;};
#define HUGE_BOOTMEM_HVO 0x0001#define HUGE_BOOTMEM_ZONES_VALID 0x0002#define HUGE_BOOTMEM_CMA 0x0004
bool hugetlb_bootmem_page_zones_valid(int nid, struct huge_bootmem_page *m);
int isolate_or_dissolve_huge_folio(struct folio *folio, struct list_head *list);int replace_free_hugepage_folios(unsigned long start_pfn, unsigned long end_pfn);void wait_for_freed_hugetlb_folios(void);struct folio *alloc_hugetlb_folio(struct vm_area_struct *vma, unsigned long addr, bool cow_from_owner);struct folio *alloc_hugetlb_folio_nodemask(struct hstate *h, int preferred_nid, nodemask_t *nmask, gfp_t gfp_mask, bool allow_alloc_fallback);struct folio *alloc_hugetlb_folio_reserve(struct hstate *h, int preferred_nid, nodemask_t *nmask, gfp_t gfp_mask);
int hugetlb_add_to_page_cache(struct folio *folio, struct address_space *mapping, pgoff_t idx);void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma, unsigned long address, struct folio *folio);
/* arch callback */int __init __alloc_bootmem_huge_page(struct hstate *h, int nid);int __init alloc_bootmem_huge_page(struct hstate *h, int nid);bool __init hugetlb_node_alloc_supported(void);
void __init hugetlb_add_hstate(unsigned order);bool __init arch_hugetlb_valid_size(unsigned long size);struct hstate *size_to_hstate(unsigned long size);
#ifndef HUGE_MAX_HSTATE#define HUGE_MAX_HSTATE 1#endif
extern struct hstate hstates[HUGE_MAX_HSTATE];extern unsigned int default_hstate_idx;
#define default_hstate (hstates[default_hstate_idx])
static inline struct hugepage_subpool *subpool_inode(struct inode *inode){ return HUGETLBFS_SB(inode->i_sb)->spool;}
static inline struct hugepage_subpool *hugetlb_folio_subpool(struct folio *folio){ return folio->_hugetlb_subpool;}
static inline void hugetlb_set_folio_subpool(struct folio *folio, struct hugepage_subpool *subpool){ folio->_hugetlb_subpool = subpool;}
static inline struct hstate *hstate_file(struct file *f){ return hstate_inode(file_inode(f));}
static inline struct hstate *hstate_sizelog(int page_size_log){ if (!page_size_log) return &default_hstate;
if (page_size_log < BITS_PER_LONG) return size_to_hstate(1UL << page_size_log);
return NULL;}
static inline struct hstate *hstate_vma(struct vm_area_struct *vma){ return hstate_file(vma->vm_file);}
static inline unsigned long huge_page_size(const struct hstate *h){ return (unsigned long)PAGE_SIZE << h->order;}
static inline unsigned long huge_page_mask(struct hstate *h){ return h->mask;}
static inline unsigned int huge_page_order(struct hstate *h){ return h->order;}
static inline unsigned huge_page_shift(struct hstate *h){ return h->order + PAGE_SHIFT;}
/** * hugetlb_linear_page_index() - linear_page_index() but in hugetlb * page size granularity. * @vma: the hugetlb VMA * @address: the virtual address within the VMA * * Return: the page offset within the mapping in huge page units. */static inline pgoff_t hugetlb_linear_page_index(struct vm_area_struct *vma, unsigned long address){ struct hstate *h = hstate_vma(vma);
return ((address - vma->vm_start) >> huge_page_shift(h)) + (vma->vm_pgoff >> huge_page_order(h));}
static inline bool order_is_gigantic(unsigned int order){ return order > MAX_PAGE_ORDER;}
static inline bool hstate_is_gigantic(struct hstate *h){ return order_is_gigantic(huge_page_order(h));}
static inline unsigned int pages_per_huge_page(const struct hstate *h){ return 1 << h->order;}
static inline unsigned int blocks_per_huge_page(struct hstate *h){ return huge_page_size(h) / 512;}
static inline struct folio *filemap_lock_hugetlb_folio(struct hstate *h, struct address_space *mapping, pgoff_t idx){ return filemap_lock_folio(mapping, idx << huge_page_order(h));}
#include <asm/hugetlb.h>
#ifndef is_hugepage_only_rangestatic inline int is_hugepage_only_range(struct mm_struct *mm, unsigned long addr, unsigned long len){ return 0;}#define is_hugepage_only_range is_hugepage_only_range#endif
#ifndef arch_clear_hugetlb_flagsstatic inline void arch_clear_hugetlb_flags(struct folio *folio) { }#define arch_clear_hugetlb_flags arch_clear_hugetlb_flags#endif
#ifndef arch_make_huge_ptestatic inline pte_t arch_make_huge_pte(pte_t entry, unsigned int shift, vm_flags_t flags){ return pte_mkhuge(entry);}#endif
#ifndef arch_has_huge_bootmem_alloc/* * Some architectures do their own bootmem allocation, so they can't use * early CMA allocation. */static inline bool arch_has_huge_bootmem_alloc(void){ return false;}#endif
static inline struct hstate *folio_hstate(struct folio *folio){ VM_BUG_ON_FOLIO(!folio_test_hugetlb(folio), folio); return size_to_hstate(folio_size(folio));}
static inline unsigned hstate_index_to_shift(unsigned index){ return hstates[index].order + PAGE_SHIFT;}
static inline int hstate_index(struct hstate *h){ return h - hstates;}
int dissolve_free_hugetlb_folio(struct folio *folio);int dissolve_free_hugetlb_folios(unsigned long start_pfn, unsigned long end_pfn);
#ifdef CONFIG_MEMORY_FAILUREextern void folio_clear_hugetlb_hwpoison(struct folio *folio);#elsestatic inline void folio_clear_hugetlb_hwpoison(struct folio *folio){}#endif
#ifdef CONFIG_ARCH_ENABLE_HUGEPAGE_MIGRATION#ifndef arch_hugetlb_migration_supportedstatic inline bool arch_hugetlb_migration_supported(struct hstate *h){ if ((huge_page_shift(h) == PMD_SHIFT) || (huge_page_shift(h) == PUD_SHIFT) || (huge_page_shift(h) == PGDIR_SHIFT)) return true; else return false;}#endif#elsestatic inline bool arch_hugetlb_migration_supported(struct hstate *h){ return false;}#endif
static inline bool hugepage_migration_supported(struct hstate *h){ return arch_hugetlb_migration_supported(h);}
/* * Movability check is different as compared to migration check. * It determines whether or not a huge page should be placed on * movable zone or not. Movability of any huge page should be * required only if huge page size is supported for migration. * There won't be any reason for the huge page to be movable if * it is not migratable to start with. Also the size of the huge * page should be large enough to be placed under a movable zone * and still feasible enough to be migratable. Just the presence * in movable zone does not make the migration feasible. * * So even though large huge page sizes like the gigantic ones * are migratable they should not be movable because its not * feasible to migrate them from movable zone. */static inline bool hugepage_movable_supported(struct hstate *h){ if (!hugepage_migration_supported(h)) return false;
if (hstate_is_gigantic(h) && !movable_gigantic_pages) return false; return true;}
/* Movability of hugepages depends on migration support. */static inline gfp_t htlb_alloc_mask(struct hstate *h){ gfp_t gfp = __GFP_COMP | __GFP_NOWARN;
gfp |= hugepage_movable_supported(h) ? GFP_HIGHUSER_MOVABLE : GFP_HIGHUSER;
return gfp;}
static inline gfp_t htlb_modify_alloc_mask(struct hstate *h, gfp_t gfp_mask){ gfp_t modified_mask = htlb_alloc_mask(h);
/* Some callers might want to enforce node */ modified_mask |= (gfp_mask & __GFP_THISNODE);
modified_mask |= (gfp_mask & __GFP_NOWARN);
return modified_mask;}
static inline bool htlb_allow_alloc_fallback(int reason){ bool allowed_fallback = false;
/* * Note: the memory offline, memory failure and migration syscalls will * be allowed to fallback to other nodes due to lack of a better chioce, * that might break the per-node hugetlb pool. While other cases will * set the __GFP_THISNODE to avoid breaking the per-node hugetlb pool. */ switch (reason) { case MR_MEMORY_HOTPLUG: case MR_MEMORY_FAILURE: case MR_SYSCALL: case MR_MEMPOLICY_MBIND: allowed_fallback = true; break; default: break; }
return allowed_fallback;}
static inline spinlock_t *huge_pte_lockptr(struct hstate *h, struct mm_struct *mm, pte_t *pte){ const unsigned long size = huge_page_size(h);
VM_WARN_ON(size == PAGE_SIZE);
/* * hugetlb must use the exact same PT locks as core-mm page table * walkers would. When modifying a PTE table, hugetlb must take the * PTE PT lock, when modifying a PMD table, hugetlb must take the PMD * PT lock etc. * * The expectation is that any hugetlb folio smaller than a PMD is * always mapped into a single PTE table and that any hugetlb folio * smaller than a PUD (but at least as big as a PMD) is always mapped * into a single PMD table. * * If that does not hold for an architecture, then that architecture * must disable split PT locks such that all *_lockptr() functions * will give us the same result: the per-MM PT lock. * * Note that with e.g., CONFIG_PGTABLE_LEVELS=2 where * PGDIR_SIZE==P4D_SIZE==PUD_SIZE==PMD_SIZE, we'd use pud_lockptr() * and core-mm would use pmd_lockptr(). However, in such configurations * split PMD locks are disabled -- they don't make sense on a single * PGDIR page table -- and the end result is the same. */ if (size >= PUD_SIZE) return pud_lockptr(mm, (pud_t *) pte); else if (size >= PMD_SIZE || IS_ENABLED(CONFIG_HIGHPTE)) return pmd_lockptr(mm, (pmd_t *) pte); /* pte_alloc_huge() only applies with !CONFIG_HIGHPTE */ return ptep_lockptr(mm, pte);}
#ifndef hugepages_supported/* * Some platform decide whether they support huge pages at boot * time. Some of them, such as powerpc, set HPAGE_SHIFT to 0 * when there is no such support */#define hugepages_supported() (HPAGE_SHIFT != 0)#endif
void hugetlb_report_usage(struct seq_file *m, struct mm_struct *mm);
static inline void hugetlb_count_init(struct mm_struct *mm){ atomic_long_set(&mm->hugetlb_usage, 0);}
static inline void hugetlb_count_add(long l, struct mm_struct *mm){ atomic_long_add(l, &mm->hugetlb_usage);}
static inline void hugetlb_count_sub(long l, struct mm_struct *mm){ atomic_long_sub(l, &mm->hugetlb_usage);}
#ifndef huge_ptep_modify_prot_start#define huge_ptep_modify_prot_start huge_ptep_modify_prot_startstatic inline pte_t huge_ptep_modify_prot_start(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep){ unsigned long psize = huge_page_size(hstate_vma(vma));
return huge_ptep_get_and_clear(vma->vm_mm, addr, ptep, psize);}#endif
#ifndef huge_ptep_modify_prot_commit#define huge_ptep_modify_prot_commit huge_ptep_modify_prot_commitstatic inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep, pte_t old_pte, pte_t pte){ unsigned long psize = huge_page_size(hstate_vma(vma));
set_huge_pte_at(vma->vm_mm, addr, ptep, pte, psize);}#endif
#ifdef CONFIG_NUMAvoid hugetlb_register_node(struct node *node);void hugetlb_unregister_node(struct node *node);#endif
/* * Check if a given raw @page in a hugepage is HWPOISON. */bool is_raw_hwpoison_page_in_hugepage(struct page *page);
static inline unsigned long huge_page_mask_align(struct file *file){ return PAGE_MASK & ~huge_page_mask(hstate_file(file));}
#else /* CONFIG_HUGETLB_PAGE */struct hstate {};
static inline unsigned long huge_page_mask_align(struct file *file){ return 0;}
static inline struct hugepage_subpool *hugetlb_folio_subpool(struct folio *folio){ return NULL;}
static inline struct folio *filemap_lock_hugetlb_folio(struct hstate *h, struct address_space *mapping, pgoff_t idx){ return NULL;}
static inline int isolate_or_dissolve_huge_folio(struct folio *folio, struct list_head *list){ return -ENOMEM;}
static inline int replace_free_hugepage_folios(unsigned long start_pfn, unsigned long end_pfn){ return 0;}
static inline void wait_for_freed_hugetlb_folios(void){}
static inline struct folio *alloc_hugetlb_folio(struct vm_area_struct *vma, unsigned long addr, bool cow_from_owner){ return NULL;}
static inline struct folio *alloc_hugetlb_folio_reserve(struct hstate *h, int preferred_nid, nodemask_t *nmask, gfp_t gfp_mask){ return NULL;}
static inline struct folio *alloc_hugetlb_folio_nodemask(struct hstate *h, int preferred_nid, nodemask_t *nmask, gfp_t gfp_mask, bool allow_alloc_fallback){ return NULL;}
static inline int __alloc_bootmem_huge_page(struct hstate *h){ return 0;}
static inline struct hstate *hstate_file(struct file *f){ return NULL;}
static inline struct hstate *hstate_sizelog(int page_size_log){ return NULL;}
static inline struct hstate *hstate_vma(struct vm_area_struct *vma){ return NULL;}
static inline struct hstate *folio_hstate(struct folio *folio){ return NULL;}
static inline struct hstate *size_to_hstate(unsigned long size){ return NULL;}
static inline unsigned long huge_page_size(struct hstate *h){ return PAGE_SIZE;}
static inline unsigned long huge_page_mask(struct hstate *h){ return PAGE_MASK;}
static inline unsigned int huge_page_order(struct hstate *h){ return 0;}
static inline unsigned int huge_page_shift(struct hstate *h){ return PAGE_SHIFT;}
static inline bool hstate_is_gigantic(struct hstate *h){ return false;}
static inline unsigned int pages_per_huge_page(struct hstate *h){ return 1;}
static inline unsigned hstate_index_to_shift(unsigned index){ return 0;}
static inline int hstate_index(struct hstate *h){ return 0;}
static inline int dissolve_free_hugetlb_folio(struct folio *folio){ return 0;}
static inline int dissolve_free_hugetlb_folios(unsigned long start_pfn, unsigned long end_pfn){ return 0;}
static inline bool hugepage_migration_supported(struct hstate *h){ return false;}
static inline bool hugepage_movable_supported(struct hstate *h){ return false;}
static inline gfp_t htlb_alloc_mask(struct hstate *h){ return 0;}
static inline gfp_t htlb_modify_alloc_mask(struct hstate *h, gfp_t gfp_mask){ return 0;}
static inline bool htlb_allow_alloc_fallback(int reason){ return false;}
static inline spinlock_t *huge_pte_lockptr(struct hstate *h, struct mm_struct *mm, pte_t *pte){ return &mm->page_table_lock;}
static inline void hugetlb_count_init(struct mm_struct *mm){}
static inline void hugetlb_report_usage(struct seq_file *f, struct mm_struct *m){}
static inline void hugetlb_count_sub(long l, struct mm_struct *mm){}
static inline pte_t huge_ptep_clear_flush(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep){#ifdef CONFIG_MMU return ptep_get(ptep);#else return *ptep;#endif}
static inline void set_huge_pte_at(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte, unsigned long sz){}
static inline void hugetlb_register_node(struct node *node){}
static inline void hugetlb_unregister_node(struct node *node){}
static inline bool hugetlbfs_pagecache_present( struct hstate *h, struct vm_area_struct *vma, unsigned long address){ return false;}
static inline void hugetlb_bootmem_alloc(void){}#endif /* CONFIG_HUGETLB_PAGE */
static inline spinlock_t *huge_pte_lock(struct hstate *h, struct mm_struct *mm, pte_t *pte){ spinlock_t *ptl;
ptl = huge_pte_lockptr(h, mm, pte); spin_lock(ptl); return ptl;}
#if defined(CONFIG_HUGETLB_PAGE) && defined(CONFIG_CMA)extern void __init hugetlb_cma_reserve(void);#elsestatic inline __init void hugetlb_cma_reserve(void){}#endif
#ifdef CONFIG_HUGETLB_PMD_PAGE_TABLE_SHARINGstatic inline bool hugetlb_pmd_shared(pte_t *pte){ return ptdesc_pmd_is_shared(virt_to_ptdesc(pte));}#elsestatic inline bool hugetlb_pmd_shared(pte_t *pte){ return false;}#endif
bool want_pmd_share(struct vm_area_struct *vma, unsigned long addr);
#ifndef __HAVE_ARCH_FLUSH_HUGETLB_TLB_RANGE/* * ARCHes with special requirements for evicting HUGETLB backing TLB entries can * implement this. */#define flush_hugetlb_tlb_range(vma, addr, end) flush_tlb_range(vma, addr, end)#endif
static inline bool __vma_shareable_lock(struct vm_area_struct *vma){ return (vma->vm_flags & VM_MAYSHARE) && vma->vm_private_data;}
bool __vma_private_lock(struct vm_area_struct *vma);
/* * Safe version of huge_pte_offset() to check the locks. See comments * above huge_pte_offset(). */static inline pte_t *hugetlb_walk(struct vm_area_struct *vma, unsigned long addr, unsigned long sz){#if defined(CONFIG_HUGETLB_PMD_PAGE_TABLE_SHARING) && defined(CONFIG_LOCKDEP) struct hugetlb_vma_lock *vma_lock = vma->vm_private_data;
/* * If pmd sharing possible, locking needed to safely walk the * hugetlb pgtables. More information can be found at the comment * above huge_pte_offset() in the same file. * * NOTE: lockdep_is_held() is only defined with CONFIG_LOCKDEP. */ if (__vma_shareable_lock(vma)) WARN_ON_ONCE(!lockdep_is_held(&vma_lock->rw_sema) && !lockdep_is_held( &vma->vm_file->f_mapping->i_mmap_rwsem));#endif return huge_pte_offset(vma->vm_mm, addr, sz);}
#endif /* _LINUX_HUGETLB_H */